class_docstr: data dictionary for pushing to tb
      
code: def add_scalar(self, scalar_dict):
      self.datapack[self.SCALAR_NAME].update(scalar_dict)
  
imports: import abc
  import tensorboardX
label_desc: Use image node_id 4 for calling the TensorboardDatapack obj's underlying member method code with example usage: obj.add_scalar(scalar_dict) without return types